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Soil Suitability / Nitrate Loading Study <br /> Thor Property a Stockton, CA Irerracon <br /> July 19, 2018 a Terracon Project No. NA187029 <br /> Leach Leach Seepage <br /> Address Date Permit# Type Tank Size Line Line Pits/Sumps <br /> (Gallons) Quantity Length (Quantity, <br /> (Feet) Size) <br /> 3430 1984 84-718 New install 1,200 3 40' (3) 33"x25' <br /> Guernsey <br /> Based on a review of the EHD permits, the septic systems in the area appear to utilize standard <br /> leach lines, and/or seepage pits. Leach lines are between 40 and 85 feet in length and seepage <br /> pits are generally 25 feet in depth. <br /> 1.3.6 Septic Repair Permit History in the Vicinity <br /> Based on the EHD file review, septic repairs in the vicinity appear to be for replacement of septic <br /> tanks and the addition of leach lines and/or sumps. The septic repair permits can be found in <br /> Appendix C of this report. <br /> 1.3.7 Expected On-Site Maximum Septic Tank Usage <br /> In response to a SSNLS Questionnaire, Mr. Thor indicated the site is proposed to be developed <br /> with a four bedroom two bathroom residence and will be occupied year round. Per conversations <br /> with EHD representatives, 70-gallons of waste per person/day with an average potential <br /> occupancy of two persons per bedroom was used to calculate average daily flow for a total of <br /> 560-gallons per day. <br /> 1.4 Groundwater Information <br /> 1.4.1 Groundwater Depth and Gradient <br /> Groundwater was not encountered in our percolation test holes excavated to a depth of 3.5 feet <br /> below grade surface (bgs) on June 5, 2018 or during the excavation of the deep boring to 25 feet <br /> bgs on June 29, 2018. According to the San Joaquin County Flood Control and Water <br /> Conservation District Groundwater Report (SJCWCD) Lines of Equal Depth to Groundwater <br /> Spring and Fall 2015 to 2016, groundwater depth lies between approximately 60 and 70 feet bgs <br /> with depth as shallow as 50 feet bgs reported in the year 2015. Based on a review of the SJCWCD <br /> Lines of Equal Elevation of Groundwater, groundwater flow gradient appears to be in a <br /> northeasterly direction. The groundwater flow direction and the depth to shallow, unconfined <br /> groundwater, if present, would likely vary depending upon seasonal variations in rainfall and other <br /> hydrogeological features.Without the benefit of on-site groundwater monitoring wells surveyed to <br /> a datum, groundwater depth and flow direction beneath the site cannot be directly ascertained. <br /> Responsive ■ Resourceful ■ Reliable 6 <br />